Regarding elementals. As I watched the gameplay with Jamie and Swen. Thoughts came up.
Fire elementals get healed when hit by a fireball or other firespell. Perhaps also standing in fire or close to fire. Even during time of day. Fight a fire elemental at night as it has less strength. In the middle of the day with the sun shining (no clouds) it will be a full strength.

Does this also transfer to other elemental signs as well?
Elementals being affected by specific elements either directly or indirectly.
Water elemental: standing close to water some healing, in water more healing. Affected by rain, water spells etc.
Ice elemental standing next to an icewall some healing in the icewall more healing. Snow indirect or direct affect.
Earth elemental standing next to a specific rock area, or other ground areas that are filled with more powerful energy, some kind of earth spells.
Ways elementals can get hurt og healed. Specific areas are more vulnerable for specific spells.